Reflection "ghost" when using EEVEE Reflection Plane
Depending on what you consider to be the ghost reflection, you can use one of the following for the glass material:

Both use &quot;backfacing&quot; from the geometry node. To eliminate the ghost, we choose only one reflection (either back or front facing).
On left, the backface is reflective (as front face is transparent).
On right, the backface is transparent (and front is reflective).
0.25 is the alpha value.